<!DOCTYPE html>
<html lang="zn-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
  
    <style>
         * {
        margin: 0;
        padding: 0;
    }
    li{
        list-style: none;
    }
    .tb-promo {
        position: relative;
        width: 520px;
        height: 280px;
        margin : 0 auto;
    }
    .tb-promo img {
        
        width: 520px;
        height: 280px;
    }
    .prev,
    .next {
        position: absolute;
        top: 50%;
        width: 20px;
        height: 30px;
        margin-top: -15px;
        text-align: center;
        line-height: 30px;
        text-decoration: none;
        color: #fff;
        font-size: 14px;
        font-weight: bold;
        background-color: rgba(0, 0, 0, 0.3);
        border-radius: 5px;
    }
    .prev {
        left: 0;
        border-radius: 0 15px 15px 0;
        
    }
    .next {
        position: absolute;
        right: 0;
        border-radius: 15px 0 0 15px;
    }
    a:hover {
        color: #c66502;
    }
    .nav {
        position: absolute;
        left:50%;
        margin-left: -35px;
        bottom: 10px;
        width: 70px;
        height: 13px;
        background-color: rgba(255, 255, 255, 0.3);
        border-radius: 7px;
    }
    .nav li {
        float: left;
        width: 8px;
        height: 8px;
        border-radius: 50%;
        margin: 3px;
        background-color: #fff;
    }
    .nav .new {
        background-color: #c66502;
    }

    </style>
</head>
<body>
    <div class="tb-promo">
        <img src="img/tb.jpg" alt="tb">
        <a href="#" class="prev">&lt;</a>
        <a href="#" class="next">&gt;</a>
        <ul class="nav">
            <li class="new"></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
    
</body>
</html>